[chromedriver] When archiving, upload a latest file that points to it.

chrome/test/chromedriver/run_buildbot_steps.py

 #!/usr/bin/env python
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Runs all the buildbot steps for ChromeDriver except for update/compile."""
 
 import bisect
 import csv
 import datetime
@@ skipping 177 matching lines @@
 def _ArchiveGoodBuild(platform, revision):
   assert platform != 'android'
   util.MarkBuildStepStart('archive build')
 
   server_name = 'chromedriver'
   if util.IsWindows():
     server_name += '.exe'
   zip_path = util.Zip(os.path.join(chrome_paths.GetBuildDir([server_name]),
                                    server_name))
 
-  build_url = '%s/chromedriver_%s_%s.%s.zip' % (
-      GS_CONTINUOUS_URL, platform, _GetVersion(), revision)
+  build_name = 'chromedriver_%s_%s.%s.zip' % (
+      platform, _GetVersion(), revision)
+  build_url = '%s/%s' % (GS_CONTINUOUS_URL, build_name)
   if slave_utils.GSUtilCopy(zip_path, build_url):
     util.MarkBuildStepError()
 
+  (latest_fd, latest_file) = tempfile.mkstemp()
+  os.write(latest_fd, build_name)
+  os.close(latest_fd)
+  latest_url = '%s/latest_%s' % (GS_CONTINUOUS_URL, platform)
+  if slave_utils.GSUtilCopy(latest_file, latest_url, mimetype='text/plain'):
+    util.MarkBuildStepError()
+  os.remove(latest_file)
+
 
 def _MaybeRelease(platform):
   """Releases a release candidate if conditions are right."""
   assert platform != 'android'
 
   # Check if the current version has already been released.
   result, _ = slave_utils.GSUtilListBucket(
       '%s/%s/chromedriver_%s*' % (
           GS_CHROMEDRIVER_BUCKET, _GetVersion(), platform),
       [])
@@ skipping 170 matching lines @@
     if options.update_log:
       util.MarkBuildStepStart('update test result log')
       _UpdateTestResultsLog(platform, options.revision, passed)
   elif passed:
     _ArchiveGoodBuild(platform, options.revision)
     _MaybeRelease(platform)
 
 
 if __name__ == '__main__':
   main()